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matherr

Usage

   #include <math.h>
   int matherr(struct exception *e);

Description

   matherr is called by functions in the math library when errors are
   detected. Users may use the library supplied matherr function or define
   their own procedures for handling errors by including a function named
   matherr in their programs. matherr must be of the form described above.

   A pointer to the exception structure will be passed to the user supplied
   matherr function when errors occur. The structure is defined in math.h
   and matherr is available in the library source for an example.

Return Value

   A zero returned from matherr means the error was handled correctly, a one
   returned means the error could not be handled.

Example 

   #include <stdio.h>
   #include <math.h>
   #include <string.h>
   #include <stdlib.h>

   int main()
   {
       printf("log(-1) = %e\n",log(-1));
       return EXIT_SUCCESS;
   }


   int matherr(x)
   struct exception *x;
   {
       if(x->type == DOMAIN)
           {
               if(strcmp(x->name,"log") == 0)
                   {
                       x->retval = log(-(x->arg1));
                       return(1);
                   }
           }
   return(0);
   }